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DC Generators: Lab Manual, Summaries of Construction

Massachusetts Institute of Technology (MIT)Construction

A lab manual for the second stage of a university-level electrical engineering course on DC generators. It includes detailed procedures for experiments on building-up voltage of self-excited shunt generator and characteristic of separately excited generator. The manual also provides a list of necessary information to inspect the disassembled machine and record data. highly technical and requires prior knowledge of electrical engineering.

Typology: Summaries

2022/2023

Uploaded on 03/14/2023

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courtneyxxx 🇺🇸

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يفيرعتلا ساركلا
ربتخم براجتلةيئابرهكلا نئاكملا
ةيناثلا ةلحرملا
DC GENERATORS
:دادعا
ميرك يربص راتس روتكدلا
نسيحم رينم مظان سدنهملا
قيفش يزوف اللهدبع سدنهملا
ةرازو ميلعتلا يلاعلا ثحبلاو يملعلا
ةعماج رابنلاا
ةيلك ةسدنهلا
مسق ةسدنهلا ةيئابرهكلا
Ministry of Higher Education & Scientific Research
University of Anbar
College of Engineering
Department of Electrical Engineering
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pf5
pf8

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DC GENERATORS

العلميوالبحثالعاليالتعليم وزارة االنبار جامعة الهندسة كلية الكهربائيةالهندسة قسم Ministry of Higher Education & Scientific Research University of Anbar College of Engineering Department of Electrical Engineering

Contents steps Title Page NO. DC GENERATORS 1 Contents 2 The Construction of DC Machines 4 Exp. No. (1.1) Objects Theory: Procedures Discussion 9 Building- up voltage of self – excited shunt generator Exp. No. (1.2) Objects: Theory: Procedures: Discussion: 13 Characteristic of Separately excited Generator Exp. No. (1.3) Objects: Procedures:

Experiment NO. 1: THE CONSTRUCTION OF DC MACHINES OBJECTS: The object of this experiment is to study some of the design detailed a D.C. machine in general. THEORY: A D.C. Machine has a stationary member called 'stator' and a rotating member called' rotor'. The Stator Consist of: 1.A yoke or cylindrical frame. 2.The field windings. 3.The field Poles. 4.The Interpol and its winding. 5.Brushes. The Rotor Consist of: 1.Armature shaft. 2.Armature core. 3.The armature winding. 4.The commutator which converts the alternating voltage in the individual armature conductors to a D.C. voltage across the brushes.

PROCEDURES:

Inspect the disassembled machine carefully and record all necessary information listed below; RUN (1): General Data

  1. Complete name plate data.
  2. Type of bearings,
  3. Method of ventilation. RUN (2) Main Poles and Field Coils
  4. Construction of field Yoke.
  5. Attachment of poles to field yoke.
  6. Construction of pole cores and shoes.
  7. Number of poles.
  8. Pole material.
  9. Length of a pole along the armature.
  10. Width of a pole around the

RUN ( 5 ): Commutator:

  1. Material
  2. Length
  3. Diameter
  4. Width of a segment
  5. Thickness of mica insulation between segments.
  6. Is the mica insulation high, flush, or undercut?
  7. Number of segments.
  8. Count the number of segments between the centers of adjacent positive and negative brushes.

RUN ( 6 ): Brushes:

  1. Number of sets
  2. Number of brushes per set
  3. Material
  4. Width of brush.
  5. Thickness of a brush
  6. How many commutator segments docs each brush cover? DISCUSSION:
  7. Draw a complete and detailed vertical cross - section of the machine Label all parts. Show the path of the flux?
  8. Draw longitudinal cross section of the commutator and label each part.
  9. State the Method of connection of different field coils.
  10. Calculates the current density in amperes per seq. Cm of brush surface at full load.
  11. If the shunt field loss is 2 %of rated load, find the field resistance.
  12. Calculate the thickness of armature core lamination, allowing 8% for insulation between Laminations.
  13. Calculate the time during which the coil of an armature remains short- circuited by a brush at rated speed.
  14. If armature copper loss is 6% of rated load, Find armature resistance for generator of step 5 above.